Knife clamp



FIG. 1 is an isometric view of a top, front, and left side of a new ornamental design for a knife clamp;

FIG. 2 is a top view of the knife clamp of FIG. 1;

FIG. 3 is a bottom view of the knife clamp of FIG. 1;

FIG. 4 is a left side elevational view, the right side elevational view being a mirror image thereof, of the knife clamp of FIG. 1;

FIG. 5 is a front elevational view of the knife clamp of FIG. 1; and,

FIG. 6 is a rear elevational view of the knife clamp of FIG. 1. 

CLAIM The ornamental design for a knife clamp, as shown. 